Method of fastening metal collars to glass lamps.



No. 814,432. PATENTED MAR. 6, 1906.

J. W. COLLINS. METHOD OF FASTENING METAL OOLLARS TO GLASS LAMPS.

APPLIOATION FILED JULYZZ, 1905.

WITNESSES INVENTOR UNITED STATES PATENT OFFICE. K JAMES w. COLLINS, or NEW MARTINSVILLE, WEST VIRGINIA. METHOD OFFASTENING METAL COLLARS TO GLASS LAMPS.

N0. 814,432. Specification of Letters Patent. Patented Maren 6, 1906. Application filed July 22, 1905. Serial No. 270.887-

To all whom it may concern.-

Be it known that I, JAMES W. COLLINS, of New Martinsville, in the county of Wetzel and State of West Virginia, have invented a new and useful Method of Fastening Metal Collars to Glass Lamps, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification, in which Figure 1 is a sectional side elevation showing one form of apparatus for forcing the collar on the lamp-neck. Fig. 2 is a cross-section of the lamp-neck with the collar in place; and Figs. 3 and 4 are views similar to Figs. 1 and 2, respectively, showing another form of the neck and collar.

My invention relates to the securing of collarsto glass lamps. The methods heretofore employed for this purpose have been defective in that cement has usually been necessary, which softens and allows the collar to become loose, or if the frictional resistance between a plain neck and a plain collar are utilized the slight differences in diameter between the necks of successive lamps prevent the proper holding in a large majority of cases.

My invention overcomes these difficulties;

Thus in the figures I show a table 6, having a 5 5 rubber pad 7, on which the lamp is set. A standard 8 has a series of holes 9 to adjust the height of the fulcrum-point of the handlever 10, having depending link 11, provided with a cup 12, which is preferably shaped to fit the top portion of the metal collar. By forcing down on the cup the collar is forced over the lamp-neck, and its lower portion will contract under the protuberances, thus looking it firmly in place. This action is assisted 6 5 by the flange 13 at the lower edge of the collar, since as the collar passes over the protuberances the flange will naturally assume an inclined position, and as this flange strikes the top of the lamp-bowl it will be bent back 7c and will thereby crimp in the corner under the protuberance.

In Figs. 3 and 4 I show a form similar to that of Figs. 1 and 2 except that the protuberance takes the form of an annular ridge, thus forming an annular recess 14 around the lower outer portion of the glass neck. The collar being of slightly less diameter than that of the ridge portion of the neck, when it is forced into place it will contract within the recess, and thus lock the collar in place.

In this case, again, the action of the lampbowl on the flange will pinch or crimp the and it consists in providing the glass neck of corner of the collar at the flange juncture a lamp with one or more protuberances which back within the recess. may be either separated or may be in the The advantages of my invention are apform ofacontinuous protuberance, giving an parent. The use of cement is done away annular recess around the neck, and then with and the collar is securelylocked in place. forcing a plain thin metal collar endwise over The slight variation in the size of the neck the glass neck, the collar being normally incident to the manufacture of the bowl and smaller than the greatest diameter of the neck does not affect the proper clamping or neck and locking the metal of the collarby lockin of the collar. The natural contraccontracting under the protuberance or in the tion of the metal under the ridge or proturecess. berance securely locks the collar, and the In the drawings, 2 represents the lampflange action assists in the gripping opera- 5 bowl, 3 the neck, and 4 the annular brass or tion. sheet-metal collar. In the form of Figs. 1 Many variations may be made in the form and 2 the exterior of the glass neck is formed and arrangement of the apparatus and the with one or more small protuberances 5. I form and size of the protuberance or ridge show two of these opposite to each other, without departing from my invention. though their number may be changed or they I claim may form a continuous ridge around the 1. The method of fastening lamp-collars toneck. The external diameter of the glass glass necks, consisting in providing a glass neck, plus the protuberance or protuberneck with a lateral protuberance or ridge, ances, is greater than the internal diameter and then forcing thereover by circumferenof the collar which is forced thereon. tial or radial expansion under direct endwise In forcing the plain collar on the neck I pressure ametal collar normally smaller than may use any desirable formof apparatus. the neck plus the protuberance or ridge,

. whereby the collar is locked by contraction or lateral extension, and thereby locking the under the protuberance or ridge; substanmetal of the collar under the protuberance or tially as described. rid e; substantially as described.

2. The method of fastening lamp-collars to I n testimony whereof I have hereunto set 5 glass necks, consisting in providing a lamp- I my hand.

bowl with a lass neck having a side protuberance or ridge, and forcing thereover by cir- JAMES COLLINS? cumferential or radial expansion a thin metal Witnesses: K

collar of less diameter than the greatest di- 1 L. M. STEPHENS, I0 ameter of the neck, and having a lower flange F. C. HELMIOK. 

